My father died when I was 10 and was in the navy so I didn't really know him well. Now I am married to a person with Borderline Personality Disorder. Can't begin to tell you what chaos living with someone with that condition means. I just have to constantly remind myself that his reality is because of his condition and I am not the wicked person he thinks I am. Of course he also sometimes thinks I am like Mother Teresa. Depends on the day - or the hour.
Hard as it is - always try to be true to yourself. Keep your head high.